ABC's 'GCB' premiered to a modest 2.2 adults 18-49 rating and 7.6 million viewers. That's much better than the finale of 'Pan Am' which drew a mere 1.2 adults 18-49 rating and 3.77 million viewers, but much lower than Pan Am's premiere last September that drew a 3.1 adults 18-49 rating and over 11 million viewers.